DE2312552B2 - Device for continuously taking samples from liquids to determine the substances or ions they contain - Google Patents

Description

^ "pT is the object of the invention, the removal of To automate samples from liquids for the purpose of analytical investigation so that no manual Moving sample vessels is more required, and thereby a continuous process of recording all

required data can be done.

This object is characteristically achieved in that to control the rotary movement of the turntable a non-contact circuit is provided.

(12a, 126, 12c) are arranged and in which ei _{Q is} above and below the

Turntable (1) on the same eraser \ U ^ ¹ »» ^ _tt JUnden. . , _j "_. _,

Turntable (1) are on the same radii Lö (... 13n) and there are three photo resistors (14a, 146, 14c) under the turntable on the same radii, whereby the light beam of a light bulb in each position through the respective hole (13a, 136, 13c) falls on the respective photo resistor, whereby the switching process assigned to this light beam is initiated by means of several relays.
4. Device according to claims 1 to 3,

Turntable.

It was also found that the non-contact Switching is advantageously carried out by light barriers or magnetic switches.

A further development then consists in that over the Turntable on several radii 3 light bulbs are arranged and located in the turntable on the same radii holes are located and are below the Turntable on the same radii three photo-resist

4. Device according to claims ι dis j, ^ -'- ^ - "'bc ^ nd where the light beam is one

characterized in that when using a _gene 30 stan «■ / _jeweil positions i through the

Magnetic switch of the turntable (1) by the glow lamp ... _ ",. ,

• ^- Lines of force cannot be influenced

Magnetic lines of force are not made of material such as glass or plastic.

35

The application relates to a device for continuously taking samples from liquids to determine the substances or ions contained therein, for carrying out the method according to claim 1 of patent 22 12 490 in which the liquid is fed through its line to a vessel by means of a hose pump and out This a certain amount of sample is taken by suction to determine the substances or ions and the vessels are located on the outer circumference of a turntable, the vessels are designed as flow-through vessels in which a certain liquid level is set by a level tube to such a height, the flexible , trunk-shaped suction tube of the analyzer is immersed in the liquids of the flow-through vessels without raising or lowering the same and, after sampling from the first flow-through vessel, the turntable rotates in one direction until the flow-through vessel with a cleaning or calibration liquid is in the suction point and from this a certain amount of liquid is taken in the same way and then the turntable continues to move in the same direction until the second flow-through vessel is in the suction point and a certain amount of sample is taken from this in the same way and this process for the other flow-through vessels repeatedly until the turntable has rotated a maximum of 360 ° C, after which it becomes 65 • · n: _i .. u: _r ; “ a; _o Qt _e || "n <T bottom:

_{The respective} positions fall through the _{hole on the} respective photo resistor, whereby the switching process assigned to this light beam is initiated by means of several relays

It is also advantageous if, when using a Magnetic switch of the turntable made of material such as cannot be influenced by the magnetic lines of force Consists of glass or plastic.

By opening and closing individual holes, the turntable can be limited in its rotary wheel be expanded.

By the first light bulb in the direction of rotation the required downtime of the turntable for the duration of the analysis of the removed The sample quantity can be switched on and at the same time the sampling can be initiated by this.

The second incandescent lamp located in the direction of rotation can determine the direction of rotation of the turntable can be reversed via relays. "..,.,

The third light bulb can interrupt the return of the turntable and the reverse Direction to be turned to the position for sucking in the liquid and then through the first Incandescent lamps interrupt the movement of the turntable in the same way, and they can Operations are repeated.

The device according to the invention is illustrated by the following example and FIGS. 1 and 2 explained:

With the help of a piston diaphragm pump, a liquid amount of up to 200 l / h is taken from a sewer or a river in which the concentration of magnesium ions is to be continuously determined and pumped into a line NW 15 to the laboratory about 500 m away. There from this liquid flow with the help of a

ler sich ιιΐϋλΐιιιαι um juu w g, - * · - - ·,

in the opposite direction to the position for suction from the first flow-through vessel for intermittent sampling of this liquid, this becomes nuMig "· ¹ -" · «"" ¹¹ -

Part of the liquid is removed from the peristaltic pump and pumped into the flow-through vessels A and B. The flow rate is 3 to 5 l / h. Next to the

<■ /

prehreller 1 there is a transfer unit 15 which is controlled by the turntable itself and two automatic suction offices 16a and Fig.

The suction burette 16a contains buffer solution that The suction burette 166 removes the sample via the pivotable arm of the transfer unit 15.

The hot water required for the analysis and for rinsing is supplied from the vessel 18 to the photometer titrator 17 supplied. The aspirated sample from the aspiration burette 16a and the buffer solution from the aspiration burette 16fc are after pivoting the transfer unit 15 measured and in the titration vessel 19 of the phototitralor given.

After completion of the titration, the titration vessel 19 is emptied and the titration is rinsed vessel 19 with hot water via 2 solenoid valves 20 and 21. The device is then ready for new titrations and is via the light bulbs' 2a to 12c with their receivers 14a to 14c and the holes 13a to 13 /? 20th while switched.

The magnesium ion concentration determined in this way is either transferred directly to the photometer taper 17 in the form of a cm ³ value or fed to a computer via the digital output of the photometer titrator 17, which immediately converts the values into degrees of German hardness ("DH).

The following values were obtained:

Time ° D.H. Line ⁰ DH. 8.00 265 9.00 210 3.15 260 9.15 230 8.30 270 9.30 280 8.45 255 9.45 300 10.00 320

The advantage of the device of the invention lies! in this, that this works continuously and automatically and the manual work required according to the state of the art not applicable. This new device has proven itself in practical factory operation with sewage and river water of the potash industry is preserved without interference.

1 sheet of drawings

Claims (3)

Patent claims: 1. Device for continuously taking samples from liquids to determine the levels therein contained substances or ions for carrying out the method according to claim 1 of the patent 22 12490, characterized in that for controlling the rotary movement of the turntable (I) a non-contact circuit is provided, the organs of which are respectively above and below the turntable (1). 2. Apparatus according to claim 1, characterized in that the contactless circuit through Light barriers or magnetic switches. 3. Device according to claims 1 and 2, characterized in that on the turntable (1) on several radii (Ha, lib) 3 light bulbs (12a, 126, 12c) are arranged and located in the hll (1) f d the same radius holes (13a turn back and then the withdrawals in the same way of rehearsals repeat themselves. The turntable is attached to a rotatably mounted hollow shaft that rotates in both The directions below the turntable are indicated by means of a motor and those on the side of the turntable for each rwhlaufeefäß has a switching cam for the actuation of? chahern and on which the flow-through vessels which are held in place by the side limits